CN1862933A - Flexible starter for power supply device - Google Patents
Flexible starter for power supply device Download PDFInfo
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- CN1862933A CN1862933A CNA2005100691354A CN200510069135A CN1862933A CN 1862933 A CN1862933 A CN 1862933A CN A2005100691354 A CNA2005100691354 A CN A2005100691354A CN 200510069135 A CN200510069135 A CN 200510069135A CN 1862933 A CN1862933 A CN 1862933A
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Abstract
The invention relates to the flexible startup apparatus used in the power providing machine, the one compensating single is output into the one pulse width modulation controlling machine when the power supplier starting, the pulse width of the switching single outputted by the pulse width controller can be produced with the gradual state, the beginning value can be gathered to the set value, it can be adopted according to the loading state when the startup finishing, so the big pressure and the current stress when the power switch is on can be avoided.
Description
Technical field
The present invention relates to a kind of flexible starter, relate in particular to a kind of being used in the power supply unit, the flexible starter of the pulse duration that the switching signal output when power supply unit is started is cumulative.
Background technology
Various power supply units has made widely and has been used to provide the stable output voltage of adjusting.Please refer to Fig. 1, be the circuit box schematic diagram of existing power supply supply.Existing power supply unit comprises suitching type circuit 30, switching controller 10, outputting inductance L, output capacitance C
1, divider resistance is (by resistance R
1With resistance R
2Composition), compensating network is (by compensating resistance R
3With building-out capacitor C
2Form).Signal V is switched in the output OUT output one of this switching controller 10
PWM, in order to controlling the change action of power switch in this suitching type circuit 30, and then obtain the stable output voltage V o that adjusts at the output of power supply unit.
This switching controller 10 comprises comparator 162, oscillator 168, D flip-flop (D typeFlip-Flop) 166 and error amplifier 160.Wherein oscillator 168 is in order to produce sawtooth voltage V
SAW, this sawtooth voltage V
SAWCan determine switching signal V
PWMSwitching frequency.The anode of error amplifier 160 is connected to reference voltage V
REF, negative terminal is connected to the feedback end FB of power supply unit, receiving feedback signals V
FBError amplifier 160 is according to reference voltage V
REFWith feedback signal V
FBIn order to output compensating signal V
COM Comparator 162 is connected to oscillator 168 and error amplifier 160, receives sawtooth signal V
SAWWith compensating signal V
COM, via the logical operation of passing through D flip-flop 166 after the comparison operation again, output switching signal V
PWM, and determine this switching signal V
PWMPulse duration.
Cooperate Fig. 1, please refer to Fig. 2, for the existing power supply supply at the each point signal waveform schematic diagram that starts moment.When power supply unit starts, the feedback signal V that the feedback end FB of power supply unit receives
FBMinimum, therefore, the very big compensating signal V of error amplifier 160 outputs
COM, the compensating signal V that comparator 162 will be very big
COMWith sawtooth voltage V
SAWAfter comparing computing,, export the switching signal V of very big pulse duration again by the logical operation of D flip-flop 166
PWMIn other words, in starting moment and the still unfounded process of output voltage, switching signal V
PWMPulse duration be maximum, and that output voltage is set up the required time is long more, will cause very big voltage and current stress to power switch.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of flexible starter, be used in the power supply unit, when starting, exports power supply unit a compensating signal to a PDM keyer, the pulse duration of this PDM keyer output switching signal can produce with cumulative state, be increased to set point gradually by initial value, and after startup is finished, adjusted according to load condition, so can be used to avoid power switch to cause very big voltage and current stress in the moment of starting shooting.
To achieve these goals, the invention provides a kind of flexible starter, when power supply unit is started shooting, use one first power supply to start electric capacity and charge, and set up a reference voltage in starting on the electric capacity to one; The first input end of one voltage regulation unit receives a built-in reference voltage, second input is connected to first output and this startup electric capacity, this voltage regulation unit has out the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect), makes that the reference voltage on this startup electric capacity is stabilized in the built-in reference voltage; One error amplifier, its the 3rd input connects this startup electric capacity and first output, receive this reference voltage, the one four-input terminal is connected to the feedback end of power supply unit, to receive a feedback signal, one second output is connected to this PDM keyer, in order to export this compensating signal.
When power supply unit is started shooting moment, this first power supply charges to this startup electric capacity and promptly is charged to this reference voltage, make this compensating signal increase gradually, thereby make the pulse duration of switching signal be increased to set point gradually by initial value along with the slow rising of this reference voltage.The cumulative purpose that reaches flexible startup of this compensating signal.
Being noted that above general introduction and ensuing detailed description are all exemplary in nature, is in order to further specify claim scope of the present invention.Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the circuit box schematic diagram of existing power supply unit;
Fig. 2 is that the existing power supply supply is at the each point signal waveform schematic diagram that starts moment;
Fig. 3 is the circuit diagram that flexible starter of the present invention is used in power supply unit;
Fig. 4 is that the present invention is at the each point signal waveform schematic diagram that starts moment; And
Fig. 5 is the circuit diagram of voltage regulation unit of the present invention.
Wherein, Reference numeral is as follows:
10-switching controller 160-error amplifier
162-comparator 166-D D-flip flop
168-oscillator R
1, R
2-resistance
R
3-compensating resistance C
1-output capacitance
C
2-building-out capacitor L-outputting inductance
30-suitching type circuit 40-flexible starter
C
Ss-startup electric capacity 402-error amplifier
The 403-second switch 405-first switch 406-voltage regulation unit
4060-current source 4061,4062,4063,4064-transistor
4065-resistance 4066-electric capacity
4067-output transistor 407-first power supply
408-second source 50-PDM keyer
502-comparator 504-oscillator
The 506-D D-flip flop
Embodiment
Please refer to Fig. 3 is used in power supply unit for flexible starter of the present invention circuit diagram.Flexible starter 40 is connected in the feedback end FB of a PDM keyer 50 and power supply unit.Wherein feedback end FB passes through divider resistance (by resistance R
1With resistance R
2Composition) is connected to output voltage V
o
With reference to figure 3, flexible starter 40 of the present invention includes one first power supply 407, and starts capacitor C again
SS, a voltage regulation unit 406 and an error amplifier 402.Wherein first power supply 407 is connected to the startup capacitor C
SS, and to starting capacitor C
SSCharge, and on this startup electric capacity, set up a reference voltage V
REFVoltage regulation unit 406 utilizes its first input end (+) to receive built-in reference voltage VR, and second input (-) is connected to first output and starts capacitor C
SSTo form a unity gain buffer, this voltage regulation unit 406 has out the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect), and then will start capacitor C
SSOn reference voltage V
REFBe stabilized within the built-in reference voltage VR.
The 3rd input (+) of error amplifier 402 is connected to the startup capacitor C
SSWith first output, its four-input terminal (-) is connected to the feedback end FB of power supply unit, and its second output is connected to PDM keyer 50, and error amplifier 402 is with reference voltage V
REFWith feedback signal V
FBError amplify, in order to output compensating signal V
COM
In the above-mentioned explanation, start moment, the reference voltage V that error amplifier 402 the 3rd input (+) receives at power supply unit
REFCan be along with starting capacitor C
SSOn charging voltage rise gradually, when it rises to built-in reference voltage VR, enter normal condition.That is to say,, be connected to the startup capacitor C starting moment
SSThe 3rd input (+) be connected to the four-input terminal (-) of the feedback end FB of power supply unit, both voltage is all zero volt, makes the output-voltage levels and the compensating signal V of error amplifier 402
COMThe initial value of voltage level also be zero volt.
With reference to figure 3, this first power supply 407 is a current source again, in order to this is started capacitor C
SSCharging current is provided.Start moment at power supply unit, this starts capacitor C
SSVoltage rise gradually, this starts capacitor C
SSCan be by the self capacity value in order to plan its start-up time.The startup capacitor C of big capacitance
SSTo increase start-up time, and then it is specified to reduce the voltage and the electric current of power switch.Therefore, this starts capacitor C by rational selection
SSCapacitance, make starting the time of delay that moment causes can be in suitable scope.
With reference to figure 3, this PDM keyer 50 comprises oscillator 504, comparator 502 and D flip-flop 506 again.Wherein this oscillator 504 is limited to high critical voltage VTH2 in order to produce, is limited to the sawtooth voltage V of low critical voltage VTH1 down on one
SAWThe anode (+) of comparator 502 is connected to second output of error amplifier 402, and its negative terminal (-) is connected to oscillator 504, receives comparison operation compensating signal V simultaneously
COMWith sawtooth signal V
SAW, operation result then is sent to D flip-flop 506, by the logical operation of D flip-flop 506, and output and decision switching signal V
PWMPulse duration.
Cooperate Fig. 3, with reference to figure 4, for the present invention at the each point signal waveform schematic diagram that starts moment.Startup moment during the power supply unit start, cooperate to start capacitor C
SSCharging, starting capacitor C
SSOn reference voltage V
REFBegin to rise by zero volt.Because voltage regulation unit 406 is a unity gain buffer, this voltage regulation unit 406 has out the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect), so reference voltage V
REFMaximum can be stabilized in built-in reference voltage VR.Reference voltage V
REFCan begin toward rising from zero volt gradually, the 3rd input (+) of error amplifier 402 is then along with reference voltage V
REFRise gradually, allow the compensating signal V of its output
COMAlso and then begin to increase from zero volt gradually.Starting capacitor C
SSCharging process in, switching signal V
PWMPulse duration begin slowly to increase by initial value, up to reference voltage V
REFReach built-in reference voltage VR, the pulse duration of this moment reaches set point, and is adjusted according to load condition after startup is finished, thereby reaches flexible startup.
Please refer to Fig. 5, be the circuit diagram of voltage regulation unit of the present invention.This voltage regulation unit 406 is brought in external circuitry by first input end (+), second input (-) and first output and is connected, its inside include by transistor 4061,4062,4063 and 4064 formed one differential to input amplifier (differential-pair input amplifier), current source 4060, resistance 4065, electric capacity 4066 and output transistor 4067.Wherein differential input amplifier is connected to current source 4060, and receive by the first input end (+) and second input (-) one differential to input signal, in order to produce an output signal V
OUTThe gate terminal of output transistor 4067 is connected to differential to input amplifier, receives this output signal V
OUTTo produce amplifying signal, be this reference voltage V
REFThe drain electrode end of output transistor 4067 is connected to this first output, and its source terminal is connected to earth terminal.It is resistance 4065 and electric capacity 4066 that the gate terminal of output transistor 4067 and drain electrode end are connected with a RC circuit, in order to the effect that affords redress.This drain electrode end of this output transistor 4067 is connected to first output of this voltage regulation unit 406, in order to the export structure of the drain electrode (open-drain) or the opener utmost point (open-collect) to be provided out.
Again with reference to figure 3, wherein the present invention more includes first switch 405 and is connected in this startup capacitor C
SSWith earth terminal.When power supply unit does not provide power output, according to feedback signal V
FBVoltage level, in order to output reset signal RST controlling 405 conductings of first switch, and then to starting capacitor C
SSDischarge and start the purpose of resetting to reach.Other has second source 408 to be connected to the startup capacitor C by second switch 403
SS, according to the switching of second switch 403, in order to provide discharging current to starting capacitor C
SSDischarge.The switching of second switch 403 is controlled by guard signal PTN.When power supply unit generation overpower, short circuit and overvoltage, according to feedback signal V
FBVoltage level, in order to output protection signal PTN, and to starting capacitor C
SSDischarge, to reach the purpose of protection.
In sum, a kind of flexible starter of the present invention, be to use in power supply unit, and the output compensating signal arrives PDM keyer when power supply unit starts, the pulse duration of this PDM keyer output switching signal can produce with cumulative state, be increased to set point gradually by initial value (being the voltage of zero volt), and after startup is finished, adjusted, so can be used to avoid power switch to cause very big voltage and current stress in the moment of starting shooting according to load condition.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1, a kind of flexible starter is used in the power supply unit, exports a compensating signal to a PDM keyer when described power supply unit starts, and it is characterized in that, includes:
One starts electric capacity;
One first power supply connects described startup electric capacity, and described startup electric capacity is charged;
One voltage regulation unit receives a built-in reference voltage by the one first input end, and one second input is connected to one first output and described startup electric capacity, in order to stablize the reference voltage on the described startup electric capacity; And
One error amplifier, one the 3rd input connects described startup electric capacity and described first output, the one four-input terminal is connected to the feedback end of described power supply unit, one second output is connected to described PDM keyer, receive a described reference voltage and a feedback signal, in order to export described compensating signal.
2, flexible starter according to claim 1 is characterized in that, described first power supply is a current source, in order to provide a charging current to described startup electric capacity.
3, flexible starter according to claim 1 is characterized in that, more includes one first switch, is connected in a described startup electric capacity and an earth terminal, is controlled by a reset signal, in order to described startup electric capacity is discharged.
4, flexible starter according to claim 1 is characterized in that, more includes:
One second source provides a discharging current; And
One second switch is connected to described startup electric capacity and described second source, is controlled by a guard signal, allows described discharging current that described startup electric capacity is discharged.
5, flexible starter according to claim 1 is characterized in that, when the voltage level of described compensating signal started at described power supply unit, its initial value was zero volt.
6, flexible starter according to claim 1 is characterized in that, described voltage regulation unit includes:
One is differential to input amplifier, is connected to a current source, receive from described first input end and described second input one differential to input signal, in order to produce an output signal; And
One output transistor, one gate terminal are connected to described differential to input amplifier, receive described output signal, and to export described reference voltage, a drain electrode end is connected to described first output, and the one source pole end is connected to earth terminal.
7, flexible starter according to claim 6 is characterized in that, described output transistor has out the export structure of the drain electrode or the opener utmost point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100691354A CN100421337C (en) | 2005-05-11 | 2005-05-11 | Flexible starter for power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100691354A CN100421337C (en) | 2005-05-11 | 2005-05-11 | Flexible starter for power supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1862933A true CN1862933A (en) | 2006-11-15 |
| CN100421337C CN100421337C (en) | 2008-09-24 |
Family
ID=37390282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100691354A Active CN100421337C (en) | 2005-05-11 | 2005-05-11 | Flexible starter for power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100421337C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789701A (en) * | 2009-12-23 | 2010-07-28 | 崇贸科技股份有限公司 | Soft switching power converter |
| CN101488713B (en) * | 2008-01-15 | 2011-05-04 | 天钰科技股份有限公司 | Voltage converter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4244283B2 (en) * | 2002-06-28 | 2009-03-25 | 株式会社リコー | DC / DC converter |
| JP2004048962A (en) * | 2002-07-15 | 2004-02-12 | Fuji Electric Holdings Co Ltd | Semiconductor integrated circuit |
| JP2005045993A (en) * | 2003-07-10 | 2005-02-17 | Seiko Instruments Inc | Pwm switching regulator control circuit |
| CN2829212Y (en) * | 2005-05-12 | 2006-10-18 | 崇贸科技股份有限公司 | Flexible starter of power supply |
-
2005
- 2005-05-11 CN CNB2005100691354A patent/CN100421337C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488713B (en) * | 2008-01-15 | 2011-05-04 | 天钰科技股份有限公司 | Voltage converter |
| CN101789701A (en) * | 2009-12-23 | 2010-07-28 | 崇贸科技股份有限公司 | Soft switching power converter |
| CN101789701B (en) * | 2009-12-23 | 2014-08-27 | 崇贸科技股份有限公司 | Soft switching power converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100421337C (en) | 2008-09-24 |
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